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  1. Cummins R2.8 (was Cumming R 2.9)

    General Discussion
    I was thinking of getting the entire ECM from a 4.5 with the tune already on it. I'm sure one could locate one in South America somewhere if they had the need/want. That assumes they are the same or similar enough that they use the same connectors as our QSB versions. I just checked over on...
  2. Cracked motor mount on JK

    General Discussion
    Looks like you are getting a load/vibration concentration right at that mounting hole. Simplest fix would be to grind out the crack, weld it back up, weld a 1/4" patch plate to the top side of the broken area, and for good measure I'd add a gusset between that horizontal member and the vertical...
  3. Cummins R2.8 (was Cumming R 2.9)

    General Discussion
    I chose the 6BT due to cost and power. No matter how much power you get out of a 4BT, a 6BT can do 50% better. Naturally it will also use more fuel, but the improvement over a gas engine is so large that you certainly won't feel cheated out of the extra MPG or three. In theory the 6BT should...
  4. Cummins R2.8 (was Cumming R 2.9)

    General Discussion
    It's already been mentioned, but worth repeating: The R2.8 is entirely made in China, and has a very poor reputation for longevity. So, if you buy one you are putting money into a regime which literally puts people in concentration camps, and you are getting an engine that will have excessive...
  5. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    I neglected to mention earlier that I have a new family member! Her name is Freya, and she does an excellent job of holding down the floor while I work: She is a 3-½ year old German Shepherd who was at a rescue shelter. She is great with kids and cats, and she has a good sense of people...
  6. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    So the AC is still a work in progress. I wanted the adjustment stem on the TXV to be accessible without having to remove a bunch of crap and without mounting the TXV in the engine bay. I decided to mount the TXV with the adjustment stem poking through the bottom of the housing. I had to drill a...
  7. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    The whole "It's a dry heat" thing is only true until July. Right around Independence Day the monsoons start here, and you get to deal with oppressive heat AND relatively high humidity :( Most car AC systems are marginal with the "dry heat". When they have to start doing a lot of latent cooling...
  8. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    Since I live in the desert part of AZ it's awfuly close to Death Valley, so the most important accessories on a vehicle here is good AC and large cupholders ;)
  9. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    Still working on the evaporator housing. I made a few mods to the initial design. I found that mounting the evaporator at a slight angle gave an increase in room behind the evaporator for the expansion valve without reducing the outlet area, which is A Good Thing™: Here's a view of the...
  10. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    Back when I replaced my pitiful Zoner alternator with a real alternator, I also mentioned that I had removed my AC blower/evaporator stuff from the engine compartment as well as the stock under-dash AC crap. This is getting replaced with a system that will fit entirely under the dash. Of course...
  11. Some 6BT questions

    Cummins 6BT / 5.9 Conversions
    You don't need to go overboard on the weight thing. The 6BT is heavy, but not ridiculously so. It's about 350lbs heavier than a GM 6.2L diesel or big block Chevy engine. So far I have not relocated any weight on my short-wheelbase K5, although I did move the front axle forward 2 inches. Handling...
  12. Show off ur motor mounts.

    General Discussion
    Are you worried about strength? You're motor mounts use more steel plate than the A-Team used in 10 episodes :lol:
  13. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    Thanks! I'm trying to keep it clean and focus just on the major stuff rather than all the minutae.
  14. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    Not much. Just a little die-grinding of the corners. Don't use the 12v exhaust gaskets as a template, as they are much larger than the actual port needs to be. Make a template of your own off the actual ports in the head and use that as your guide.
  15. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    Looks like my memory was faulty. According to my 1991 shop manual,the 14b axles have always had press-fit outer pinion bearings. It was every but as much fun to assemble as I hoped it would be. Cliff notes for those who have assembled D60' and D70's; 10b and 14bsf. if you think the crush...
  16. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    It started out so simple; one of the straps retaining my rear u-joint had light between the strap and the u-joint cap. I have been chasing an intermittent bump-induced driveshaft vibe for months now, so I figured I may as well check out/fix the strap to make sure the cap isn't walking around in...
  17. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    Not much choice. I may have to run a lake pipe exhaust if there is too much BP, as restriction is a function of both diameter and length. I got the 6.7 manifold with the turbo, so it's going to get ported and swapped on.
  18. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    But wait! There's more! Another item on the to-do list for the New Year was new tires. I had originally intended on running the same 37" BFG KO2's that Todd is running on his Jeep. However, perusal of the reviews on this tire revealed a disturbing trend; it seems they wear rapidly when they are...
  19. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    Quite a bit has happened since the last update. I have been chasing an intermittent bump-induced driveshaft vibration for several months. Despite rebuilding the CV and replacing the output bearings in the t-case the vibration persists. :gaah: I will get it figured out one of these days. My...
  20. A K5 Cummins Conversion: The saga continues...

    Buildup Showcase Threads - All Engines, Vehicles
    So, the initial drive showed a few issues. Most were simple fixes of minor things, but one major problem was a random failure to crank. I had a starter relay mounted on the fender. and from that relay a 14 gauge wire snaked down to the starter along the main battery cable, a distance of perhaps...
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